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| 1 | +<!DOCTYPE html> |
| 2 | +<html> |
| 3 | + |
| 4 | +<head> |
| 5 | + <meta charset="utf-8" /> |
| 6 | + <title>seastianLabs</title> |
| 7 | + <style> |
| 8 | + * { |
| 9 | + padding: 0; |
| 10 | + margin: 0; |
| 11 | + } |
| 12 | + |
| 13 | + canvas { |
| 14 | + background: #eee; |
| 15 | + display: block; |
| 16 | + margin: 0 auto; |
| 17 | + } |
| 18 | + </style> |
| 19 | +</head> |
| 20 | + |
| 21 | +<body> |
| 22 | + <canvas id="myCanvas" width="800" height="600"></canvas> |
| 23 | + <script> |
| 24 | + var canvas = document.getElementById("myCanvas"); |
| 25 | + var ctx = canvas.getContext("2d"); |
| 26 | + var rightPressed = false; |
| 27 | + var leftPressed = false; |
| 28 | + var upPressed = false; |
| 29 | + var downPressed = false; |
| 30 | + var L1 = 100; |
| 31 | + var L2 = 50; |
| 32 | + var A1 = 0; |
| 33 | + var A2 = 0; |
| 34 | + var Pos1x = L1 * Math.cos(A1); |
| 35 | + var Pos1y = L1 * Math.sin(A1); |
| 36 | + var Pos2x = L2 * Math.cos(A2); |
| 37 | + var Pos2y = L2 * Math.sin(A2); |
| 38 | + |
| 39 | + document.addEventListener("keydown", keyDownHandler, false); |
| 40 | + document.addEventListener("keyup", keyUpHandler, false); |
| 41 | + |
| 42 | + function keyDownHandler(e) { |
| 43 | + if (e.keyCode == 39) { |
| 44 | + rightPressed = true; |
| 45 | + } else if (e.keyCode == 37) { |
| 46 | + leftPressed = true; |
| 47 | + } else if (e.keyCode == 38) { |
| 48 | + upPressed = true; |
| 49 | + } else if (e.keyCode == 40) { |
| 50 | + downPressed = true; |
| 51 | + } |
| 52 | + } |
| 53 | + |
| 54 | + function keyUpHandler(e) { |
| 55 | + if (e.keyCode == 39) { |
| 56 | + rightPressed = false; |
| 57 | + } else if (e.keyCode == 37) { |
| 58 | + leftPressed = false; |
| 59 | + } else if (e.keyCode == 38) { |
| 60 | + upPressed = false; |
| 61 | + } else if (e.keyCode == 40) { |
| 62 | + downPressed = false; |
| 63 | + } |
| 64 | + } |
| 65 | + |
| 66 | + function drawBrazo1() { |
| 67 | + Pos1x = L1 * Math.cos(A1); |
| 68 | + Pos1y = L1 * Math.sin(A1); |
| 69 | + ctx.beginPath(); |
| 70 | + ctx.moveTo(0, 0); |
| 71 | + ctx.lineTo(Pos1x, Pos1y); |
| 72 | + ctx.stroke(); |
| 73 | + ctx.closePath(); |
| 74 | + } |
| 75 | + |
| 76 | + function drawBrazo2() { |
| 77 | + Pos2x = L2 * Math.cos(A2); |
| 78 | + Pos2y = L2 * Math.sin(A2); |
| 79 | + ctx.beginPath(); |
| 80 | + ctx.moveTo(Pos1x, Pos1y); |
| 81 | + ctx.lineTo(Pos1x + Pos2x, Pos1y + Pos2y); |
| 82 | + ctx.stroke(); |
| 83 | + ctx.closePath(); |
| 84 | + } |
| 85 | + |
| 86 | + function draw() { |
| 87 | + ctx.clearRect(0, 0, canvas.width, canvas.height); |
| 88 | + drawBrazo1(); |
| 89 | + drawBrazo2(); |
| 90 | + if (rightPressed) { |
| 91 | + A1 += 0.01; |
| 92 | + } |
| 93 | + if (leftPressed) { |
| 94 | + A1 -= 0.01; |
| 95 | + } |
| 96 | + if (upPressed) { |
| 97 | + A2 += 0.01; |
| 98 | + } |
| 99 | + if (downPressed) { |
| 100 | + A2 -= 0.01; |
| 101 | + } |
| 102 | + |
| 103 | + requestAnimationFrame(draw); |
| 104 | + } |
| 105 | + draw(); |
| 106 | + </script> |
| 107 | + |
| 108 | +</body> |
| 109 | + |
| 110 | +</html> |
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